Oxygen reduction reaction activities for various-monolayer-thick Pt shells on PtxNi100-x(111)

Masato Asano; Ryutaro Kawamura; Naoto Todoroki; Toshimasa Wadayama

doi:10.1149/06917.0619ecst

Oxygen reduction reaction activities for various-monolayer-thick Pt shells on Pt_xNi_100-x(111)

Masato Asano, Ryutaro Kawamura, Naoto Todoroki, Toshimasa Wadayama

ENV - Frontier Science for Advanced Environment

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

We studied the oxygen reduction reaction (ORR) activities for two monolayer (ML)-thick Pt on Pt_xNi_100-x(111) (Pt_2ML/Pt_xNi_100-x(111)) model core-shell catalysts fabricated by molecular beam epitaxy (MBE). Low-energy electron diffraction patterns for all Pt_2ML/Pt_xNi_100-x(111) showed six-fold surface symmetry with longrange ordering, indicating a (111) atomic arrangement of the topmost Pt shell layers. Furthermore, scanning tunneling microscopy images of the Pt_2ML/Pt₅₀Ni₅₀(111) and Pt_2ML/Pt₂₅Ni₇₅(111) surfaces exhibited Moiré-like height modulations, which are likely induced by large lattice mismatches between the topmost Pt(111) shell layers and the Pt-Ni(111) substrates. The ORR activity of Pt_2ML/Pt_xNi_100-x(111) increased with the Ni composition; the enhancement factors are 8-, 18-, and 25-fold vs. Pt(111) for Pt_2ML/Pt₇₅Ni₂₅(111), Pt_2ML/Pt₅₀Ni₅₀(111), and Pt_2ML/Pt₂₅Ni₇₅(111), respectively. The results suggested that the Pt surface strains induced by lattice mismatches between the Pt shells and Pt-Ni substrates increased with the Ni composition, leading to a marked enhancement in ORR activity, particularly for Pt_2ML/Pt₂₅Ni₇₅(111).

Original language	English
Title of host publication	Polymer Electrolyte Fuel Cells 15, PEFC 15
Editors	H. A. Gasteiger, A. Z. Weber, V. K. Ramani, T. F. Fuller, R. A. Mantz, H. Uchida, F. N. Buchi, M. Edmundson, C. Coutanceau, J. M. Fenton, S. Mitsushima, T. J. Schmidt, K. Shinohara, K. Swider-Lyons, D. J. Jones, B. S. Pivovar, K. E. Ayers, K. A. Perry, S. R. Narayanan, P. Strasser
Publisher	Electrochemical Society Inc.
Pages	619-624
Number of pages	6
Edition	17
ISBN (Electronic)	9781607685395
DOIs	https://doi.org/10.1149/06917.0619ecst
Publication status	Published - 2015
Event	Symposium on Polymer Electrolyte Fuel Cells 15, PEFC 2015 - 228th ECS Meeting - Phoenix, United States Duration: 2015 Oct 11 → 2015 Oct 15

Publication series

Name	ECS Transactions
Number	17
Volume	69
ISSN (Print)	1938-6737
ISSN (Electronic)	1938-5862

Other

Other	Symposium on Polymer Electrolyte Fuel Cells 15, PEFC 2015 - 228th ECS Meeting
Country/Territory	United States
City	Phoenix
Period	15/10/11 → 15/10/15

ASJC Scopus subject areas

Engineering(all)

Access to Document

10.1149/06917.0619ecst

Cite this

Asano, M., Kawamura, R., Todoroki, N., & Wadayama, T. (2015). Oxygen reduction reaction activities for various-monolayer-thick Pt shells on Pt_xNi_100-x(111). In H. A. Gasteiger, A. Z. Weber, V. K. Ramani, T. F. Fuller, R. A. Mantz, H. Uchida, F. N. Buchi, M. Edmundson, C. Coutanceau, J. M. Fenton, S. Mitsushima, T. J. Schmidt, K. Shinohara, K. Swider-Lyons, D. J. Jones, B. S. Pivovar, K. E. Ayers, K. A. Perry, S. R. Narayanan, & P. Strasser (Eds.), Polymer Electrolyte Fuel Cells 15, PEFC 15 (17 ed., pp. 619-624). (ECS Transactions; Vol. 69, No. 17). Electrochemical Society Inc.. https://doi.org/10.1149/06917.0619ecst

Oxygen reduction reaction activities for various-monolayer-thick Pt shells on Pt_xNi_100-x(111). / Asano, Masato; Kawamura, Ryutaro; Todoroki, Naoto et al.
Polymer Electrolyte Fuel Cells 15, PEFC 15. ed. / H. A. Gasteiger; A. Z. Weber; V. K. Ramani; T. F. Fuller; R. A. Mantz; H. Uchida; F. N. Buchi; M. Edmundson; C. Coutanceau; J. M. Fenton; S. Mitsushima; T. J. Schmidt; K. Shinohara; K. Swider-Lyons; D. J. Jones; B. S. Pivovar; K. E. Ayers; K. A. Perry; S. R. Narayanan; P. Strasser. 17. ed. Electrochemical Society Inc., 2015. p. 619-624 (ECS Transactions; Vol. 69, No. 17).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Asano, M, Kawamura, R, Todoroki, N & Wadayama, T 2015, Oxygen reduction reaction activities for various-monolayer-thick Pt shells on Pt_xNi_100-x(111). in HA Gasteiger, AZ Weber, VK Ramani, TF Fuller, RA Mantz, H Uchida, FN Buchi, M Edmundson, C Coutanceau, JM Fenton, S Mitsushima, TJ Schmidt, K Shinohara, K Swider-Lyons, DJ Jones, BS Pivovar, KE Ayers, KA Perry, SR Narayanan & P Strasser (eds), Polymer Electrolyte Fuel Cells 15, PEFC 15. 17 edn, ECS Transactions, no. 17, vol. 69, Electrochemical Society Inc., pp. 619-624, Symposium on Polymer Electrolyte Fuel Cells 15, PEFC 2015 - 228th ECS Meeting, Phoenix, United States, 15/10/11. https://doi.org/10.1149/06917.0619ecst

Asano M, Kawamura R, Todoroki N , Wadayama T. Oxygen reduction reaction activities for various-monolayer-thick Pt shells on Pt_xNi_100-x(111). In Gasteiger HA, Weber AZ, Ramani VK, Fuller TF, Mantz RA, Uchida H, Buchi FN, Edmundson M, Coutanceau C, Fenton JM, Mitsushima S, Schmidt TJ, Shinohara K, Swider-Lyons K, Jones DJ, Pivovar BS, Ayers KE, Perry KA, Narayanan SR, Strasser P, editors, Polymer Electrolyte Fuel Cells 15, PEFC 15. 17 ed. Electrochemical Society Inc. 2015. p. 619-624. (ECS Transactions; 17). doi: 10.1149/06917.0619ecst

Asano, Masato ; Kawamura, Ryutaro ; Todoroki, Naoto et al. / Oxygen reduction reaction activities for various-monolayer-thick Pt shells on Pt_xNi_100-x(111). Polymer Electrolyte Fuel Cells 15, PEFC 15. editor / H. A. Gasteiger ; A. Z. Weber ; V. K. Ramani ; T. F. Fuller ; R. A. Mantz ; H. Uchida ; F. N. Buchi ; M. Edmundson ; C. Coutanceau ; J. M. Fenton ; S. Mitsushima ; T. J. Schmidt ; K. Shinohara ; K. Swider-Lyons ; D. J. Jones ; B. S. Pivovar ; K. E. Ayers ; K. A. Perry ; S. R. Narayanan ; P. Strasser. 17. ed. Electrochemical Society Inc., 2015. pp. 619-624 (ECS Transactions; 17).

@inproceedings{d63c8b5e7a01462ca58131aba43535db,

title = "Oxygen reduction reaction activities for various-monolayer-thick Pt shells on PtxNi100-x(111)",

abstract = "We studied the oxygen reduction reaction (ORR) activities for two monolayer (ML)-thick Pt on PtxNi100-x(111) (Pt2ML/PtxNi100-x(111)) model core-shell catalysts fabricated by molecular beam epitaxy (MBE). Low-energy electron diffraction patterns for all Pt2ML/PtxNi100-x(111) showed six-fold surface symmetry with longrange ordering, indicating a (111) atomic arrangement of the topmost Pt shell layers. Furthermore, scanning tunneling microscopy images of the Pt2ML/Pt50Ni50(111) and Pt2ML/Pt25Ni75(111) surfaces exhibited Moir{\'e}-like height modulations, which are likely induced by large lattice mismatches between the topmost Pt(111) shell layers and the Pt-Ni(111) substrates. The ORR activity of Pt2ML/PtxNi100-x(111) increased with the Ni composition; the enhancement factors are 8-, 18-, and 25-fold vs. Pt(111) for Pt2ML/Pt75Ni25(111), Pt2ML/Pt50Ni50(111), and Pt2ML/Pt25Ni75(111), respectively. The results suggested that the Pt surface strains induced by lattice mismatches between the Pt shells and Pt-Ni substrates increased with the Ni composition, leading to a marked enhancement in ORR activity, particularly for Pt2ML/Pt25Ni75(111).",

author = "Masato Asano and Ryutaro Kawamura and Naoto Todoroki and Toshimasa Wadayama",

note = "Publisher Copyright: {\textcopyright} The Electrochemical Society.; Symposium on Polymer Electrolyte Fuel Cells 15, PEFC 2015 - 228th ECS Meeting ; Conference date: 11-10-2015 Through 15-10-2015",

year = "2015",

doi = "10.1149/06917.0619ecst",

language = "English",

series = "ECS Transactions",

publisher = "Electrochemical Society Inc.",

number = "17",

pages = "619--624",

editor = "Gasteiger, {H. A.} and Weber, {A. Z.} and Ramani, {V. K.} and Fuller, {T. F.} and Mantz, {R. A.} and H. Uchida and Buchi, {F. N.} and M. Edmundson and C. Coutanceau and Fenton, {J. M.} and S. Mitsushima and Schmidt, {T. J.} and K. Shinohara and K. Swider-Lyons and Jones, {D. J.} and Pivovar, {B. S.} and Ayers, {K. E.} and Perry, {K. A.} and Narayanan, {S. R.} and P. Strasser",

booktitle = "Polymer Electrolyte Fuel Cells 15, PEFC 15",

edition = "17",

}

TY - GEN

T1 - Oxygen reduction reaction activities for various-monolayer-thick Pt shells on PtxNi100-x(111)

AU - Asano, Masato

AU - Kawamura, Ryutaro

AU - Todoroki, Naoto

AU - Wadayama, Toshimasa

N1 - Publisher Copyright: © The Electrochemical Society.

PY - 2015

Y1 - 2015

N2 - We studied the oxygen reduction reaction (ORR) activities for two monolayer (ML)-thick Pt on PtxNi100-x(111) (Pt2ML/PtxNi100-x(111)) model core-shell catalysts fabricated by molecular beam epitaxy (MBE). Low-energy electron diffraction patterns for all Pt2ML/PtxNi100-x(111) showed six-fold surface symmetry with longrange ordering, indicating a (111) atomic arrangement of the topmost Pt shell layers. Furthermore, scanning tunneling microscopy images of the Pt2ML/Pt50Ni50(111) and Pt2ML/Pt25Ni75(111) surfaces exhibited Moiré-like height modulations, which are likely induced by large lattice mismatches between the topmost Pt(111) shell layers and the Pt-Ni(111) substrates. The ORR activity of Pt2ML/PtxNi100-x(111) increased with the Ni composition; the enhancement factors are 8-, 18-, and 25-fold vs. Pt(111) for Pt2ML/Pt75Ni25(111), Pt2ML/Pt50Ni50(111), and Pt2ML/Pt25Ni75(111), respectively. The results suggested that the Pt surface strains induced by lattice mismatches between the Pt shells and Pt-Ni substrates increased with the Ni composition, leading to a marked enhancement in ORR activity, particularly for Pt2ML/Pt25Ni75(111).

AB - We studied the oxygen reduction reaction (ORR) activities for two monolayer (ML)-thick Pt on PtxNi100-x(111) (Pt2ML/PtxNi100-x(111)) model core-shell catalysts fabricated by molecular beam epitaxy (MBE). Low-energy electron diffraction patterns for all Pt2ML/PtxNi100-x(111) showed six-fold surface symmetry with longrange ordering, indicating a (111) atomic arrangement of the topmost Pt shell layers. Furthermore, scanning tunneling microscopy images of the Pt2ML/Pt50Ni50(111) and Pt2ML/Pt25Ni75(111) surfaces exhibited Moiré-like height modulations, which are likely induced by large lattice mismatches between the topmost Pt(111) shell layers and the Pt-Ni(111) substrates. The ORR activity of Pt2ML/PtxNi100-x(111) increased with the Ni composition; the enhancement factors are 8-, 18-, and 25-fold vs. Pt(111) for Pt2ML/Pt75Ni25(111), Pt2ML/Pt50Ni50(111), and Pt2ML/Pt25Ni75(111), respectively. The results suggested that the Pt surface strains induced by lattice mismatches between the Pt shells and Pt-Ni substrates increased with the Ni composition, leading to a marked enhancement in ORR activity, particularly for Pt2ML/Pt25Ni75(111).

UR - http://www.scopus.com/inward/record.url?scp=84946098583&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84946098583&partnerID=8YFLogxK

U2 - 10.1149/06917.0619ecst

DO - 10.1149/06917.0619ecst

M3 - Conference contribution

AN - SCOPUS:84946098583

T3 - ECS Transactions

SP - 619

EP - 624

BT - Polymer Electrolyte Fuel Cells 15, PEFC 15

A2 - Gasteiger, H. A.

A2 - Weber, A. Z.

A2 - Ramani, V. K.

A2 - Fuller, T. F.

A2 - Mantz, R. A.

A2 - Uchida, H.

A2 - Buchi, F. N.

A2 - Edmundson, M.

A2 - Coutanceau, C.

A2 - Fenton, J. M.

A2 - Mitsushima, S.

A2 - Schmidt, T. J.

A2 - Shinohara, K.

A2 - Swider-Lyons, K.

A2 - Jones, D. J.

A2 - Pivovar, B. S.

A2 - Ayers, K. E.

A2 - Perry, K. A.

A2 - Narayanan, S. R.

A2 - Strasser, P.

PB - Electrochemical Society Inc.

T2 - Symposium on Polymer Electrolyte Fuel Cells 15, PEFC 2015 - 228th ECS Meeting

Y2 - 11 October 2015 through 15 October 2015

ER -